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The External Corrosion Direct Assessment (ECDA) is formally listed as an acceptable integrity assessment method within Subpart O, Part 192 of the code of federal regulations regarding gas transmission pipeline integrity management2. It is a 4 step continuous improvement process to identify and address locations where external corrosion activity has occurred, is occurring or may occur1. In the pre-assessment phase, a comprehensive right-of-way inspection is performed, and pipeline operability data is collected to verify the feasibility of conducting a full ECDA for the pipeline under evaluation. In the indirect inspection phase, the status of cathodic protection and pipeline coating is tested using methods such as Close Interval Potential Surveys (CIPS) and Direct Current Voltage Gradient (DCVG) surveys.
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The quality of indirect inspection data is critical in an External Corrosion Direct Assessment (ECDA). The need exists to increase the accuracy of the field data collection, to improve the data processing and to effectively present the results. This paper describes several challenges.
This standard practice outlines a methodology to assess pipeline integrity because of the threat of internal corrosion for onshore and offshore pipelines and other piping systems that normally carry water-saturated or undersaturated natural and/or raw gas with condensed water, or with water and liquid hydrocarbons, termed wet gas internal corrosion direct assessment (WG-ICDA).
This standard practice provides guidance on selecting and implementing the Pipeline Integrity Management (PIM) methods (i.e., technologies and processes) to assess and to mitigate threats to pipeline integrity. Predominant threats to pipeline integrity are external corrosion (EC), internal corrosion (IC), stress corrosion cracking (SCC), mechanical damage (first, second, and third party or vandalism), equipment malfunctioning, manufacturing anomalies, construction anomalies, incorrect operations, weather-related, and external forces. The standard is focused on the “selection” and “implementation” of methods and best practices to manage pipeline integrity, but not necessarily on defining all aspects of PIM programs.
HISTORICAL DOCUMENT. Methodology for applying the internal corrosion direct assessment (ICDA) process for multiphase flow onshore and offshore pipeline systems.
管道外壁腐蚀直接评价方法的推荐作法 NACE external corrosion direct assessment (ECDA) process — assessing and reducing the impact of external corrosion on pipeline integrity.
湿气管道内腐蚀直接评价方法
Internal corrosion direct assessment (ICDA) for pipelines carrying natural gas or liquid hydrocarbons with water (wet gas internal corrosion direct assessment (WG-ICDA)). Pre-assessment, Indirect Inspection, Detailed Examination, and Post-assessment.
HISTORICAL DOCUMENT. This standard practice formalizes a methodology to assess internal corrosion for onshore and offshore pipelines and other piping systems that normally carry natural gas with condensed water, or with water and liquid hydrocarbons, termed wet gas internal corrosion direct assessment (WG-ICDA). This standard is maintained by Task Group 305.
Internal corrosion direct assessment (ICDA) for pipelines carrying wet gas. (WG-ICDA). Four components of ICDA: Preassessment, Indirect Inspection, Detailed Examination, and Postassessment.